default or selected kernelversion does not have config value CONFIG_SND_PXA2XX_SOC_EM_X270.
Result is shown for kernelversion 6.9.9

SoC Audio support for CompuLab CM-X300

modulename: snd-soc-em-x270.ko

configname: CONFIG_SND_PXA2XX_SOC_EM_X270

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>SoC Audio support for CompuLab CM-X300
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
Say Y if you want to add support for SoC audio on
CompuLab EM-x270, eXeda and CM-X300 machines.

source code:
sound/soc//pxa/